1-10-08Lec02

# 1-10-08Lec02 - Lecture 2-1 Physics 241 –Sample Quiz A...

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Unformatted text preview: Lecture 2-1 Physics 241 –Sample Quiz A –Jan. 8, 2008 Two point charges are separated by distance d as shown. Where can you put a third charge of 1 C so that there is no net electric force acting on it? (Take Q > 0.) a)to the right of charge -2Q b)to the left of charge Q c) between the two charges d)some other place e)nowhere Q-2Q d Lecture 2-2 Electric Field The net Coulomb force on a given charge is always proportional to the strength of that charge. Define electric field , which is independent of the test charge, q, and depends only on position in space: F E q = ca ca 2 1 ˆ 4 F Q E r q r π ε = = a a Electric Field due to a Point Charge Q Lecture 2-3 Electric Field With this concept, we can “map”the electric field anywhere in space produced by any arbitrary: a Vector field 77 82 83 68 55 66 83 75 80 90 91 75 71 80 72 84 73 57 88 92 77 56 88 73 64 Lecture 2-4 Electric Field due to Multiple Point Charges The force on a test charge is then given by ⋯ a a a a + + + = 3 2 1 F F F F so the electric field is, by definition, given by ⋯ a a a ⋯ a a a a a + + + = + + + = = 3 2 1 3 2 1 E E E q F q F q F q F E Principle of Superposition! Lecture 2-5 Example: Two charges of the same magnitude • Both charges > 0 • One is > 0, the other < 0-q q electric dipole of dipole moment : p qd = ca ca d ca if |q R |>|q L | if |q L |>|q R | 3 2 kp E x = Lecture 2-6...
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1-10-08Lec02 - Lecture 2-1 Physics 241 –Sample Quiz A...

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